A low-pressure carbonate reservoir gas well temporary plugging workover fluid and its preparation and application method

A carbonate reservoir and workover fluid technology, which is applied in wellbore/well components, chemical instruments and methods, earthwork drilling and production, etc., can solve the problem of long contact time between formation and fluid, severe water lock damage, and inability to Realize problems such as temporary plugging and workover, achieve good anti-swelling effect, reduce damage, and reduce water lock damage

Active Publication Date: 2021-06-01
西安石油大油气科技有限公司
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the workover operation time is long, and the contact time between the formation and the fluid is long, especially for low-porosity and low-permeability gas reservoirs, the degree of water lock damage will still be serious
[0005] Low solids and clay-free workover fluids can quickly form plugs in holes or fractures and control the loss of workover fluids. The disadvantage is that the solid phase particle invasion during the workover process will easily cause reservoir pore throat blockage, making it difficult to flow back , especially for low-permeability gas layers, it is difficult to remove plugging, and it is easy to cause damage to the reservoir
It can be seen that for the current gas wells in low-pressure carbonate reservoirs containing single or multiple packers, it is currently impossible to achieve temporary plugging and workover. Temporary plugging and workover fluid suitable for this type of tubing string with a packer in low-pressure carbonate reservoir gas wells and its application method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A low-pressure carbonate reservoir gas well temporary plugging workover fluid and its preparation and application method
  • A low-pressure carbonate reservoir gas well temporary plugging workover fluid and its preparation and application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] G×-× gas well replacement damaged tubing workover operation

[0076] Firstly, calculate the required workover fluid density and dosage based on the formation pressure coefficient and wellbore structure of G×-× well; then, configure two workover fluid slugs; finally, carry out well killing and workover operations . The specific operation steps are as follows:

[0077] 1) Clean the liquid distribution tank, configure 8 m 3 Low solid phase water-locking type temporary plugging fluid slug and 180 m 3 Water-based anti-swell inhibitor slug.

[0078] 2) Check the blowout prevention pipeline. After passing the pressure test, release the pressure at the wellhead, and start to kill the well when the pressure drops below 5MPa.

[0079] 3) Inject a 5.0m water-based anti-swelling inhibitor slug from the oil jacket annulus 3 , and then inject a 5m slug of low solid phase water-locking temporary plugging fluid 3 , and then injected water-based anti-swelling inhibitor slug 25m ...

Embodiment 2

[0087] Lian × gas well bridge plug salvage and workover operations

[0088] Firstly, calculate the required workover fluid density and dosage according to the formation pressure coefficient and wellbore structure of the Lian× gas well; then, configure two workover fluid slugs; finally, carry out well killing and workover operations. The specific operation steps are as follows:

[0089] 1) Clean the liquid distribution tank, configure 5 m 3 Low solid phase water-locking type temporary plugging fluid slug and 150 m 3 Water-based anti-swell inhibitor slug.

[0090] 2) Check the blowout prevention pipeline. After the pressure test is qualified, the wellhead is ignited and blowout is started. When the pressure is released below 5MPa, the well killing will be carried out.

[0091] 3) Inject water-based anti-swelling inhibitor slug 3m from the oil jacket annulus 3 , and then inject a 5m slug of low solid phase water-locking temporary plugging fluid 3 , and then injected water-b...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
lengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
lengthaaaaaaaaaa
Login to view more

Abstract

A low-pressure carbonate reservoir gas well temporary plugging and workover fluid and its preparation and application method. The other plug is a water-based anti-swelling inhibitor plug, which is mainly used to further reduce the damage caused by a small amount of workover fluid entering the reservoir due to micro-leakage. harm. The invention has the characteristics of small leakage, small reservoir damage, strong pressure bearing capacity and water locking capacity, good universality, non-toxic, harmless, convenient construction, easy flowback, safety and environmental protection, and the like. It is mainly used for temporary plugging and killing of carbonate reservoirs during well workover, especially suitable for workover operations of gas wells in low-pressure carbonate reservoirs with pipe strings and packers, so as to reduce the damage of workover fluid to the formation.

Description

technical field [0001] The invention relates to the technical field of gas well workover, in particular to a temporary plugging and workover fluid for gas wells in low-pressure carbonate rock reservoirs and its preparation and application methods. Background technique [0002] Well workover is a work to restore normal production of oil and gas wells or increase production capacity to eliminate faults and improve wellbore conditions. The working fluid used in the workover operation is called the workover fluid. The workover fluid can ensure the safety of construction operations and prevent the workover fluid from leaking into the formation, thereby protecting the reservoir. [0003] At present, in the workover process of low-pressure gas fields at home and abroad, clay-free water-based workover fluids are generally used. There are roughly three types of workover fluids: clay-free clean brine workover fluids, low-solids-free Clay phase workover fluid, other types such as foam...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/508C09K8/035C08G65/28E21B33/13
CPCC08G65/2609C09K8/035C09K8/508C09K2208/08C09K2208/12C09K2208/18E21B33/13
Inventor 奚运涛王雷胥珊娜孙良周好斌张骁勇陈文浩万林
Owner 西安石油大油气科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap